When the speaker of the poem refers to the greek goddesses, lethe and psyche in "ode on melancholy," he is using the literary device of options: apostrophe metaphor personification allusion

In the poem "Ode on Melancholy," when the speaker refers to the Greek goddesses, the river Lethe and Psyche, he is using Allusion. Allusion is a literary device that is used when referring to characters and/or events that are found in other works to add more depth to the story.